Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 241 insertions, 0 deletions

diff --git a/kernel/itimer.c b/kernel/itimer.c
new file mode 100644
index 000000000000..e9a40e947e07
--- /dev/null
+++ b/kernel/itimer.c
@@ -0,0 +1,241 @@
+/*
+ * linux/kernel/itimer.c
+ *
+ * Copyright (C) 1992 Darren Senn
+ */
+
+/* These are all the functions necessary to implement itimers */
+
+#include <linux/mm.h>
+#include <linux/smp_lock.h>
+#include <linux/interrupt.h>
+#include <linux/syscalls.h>
+#include <linux/time.h>
+#include <linux/posix-timers.h>
+
+#include <asm/uaccess.h>
+
+static unsigned long it_real_value(struct signal_struct *sig)
+{
+        unsigned long val = 0;
+        if (timer_pending(&sig->real_timer)) {
+                val = sig->real_timer.expires - jiffies;
+
+                /* look out for negative/zero itimer.. */
+                if ((long) val <= 0)
+                        val = 1;
+        }
+        return val;
+}
+
+int do_getitimer(int which, struct itimerval *value)
+{
+        struct task_struct *tsk = current;
+        unsigned long interval, val;
+        cputime_t cinterval, cval;
+
+        switch (which) {
+        case ITIMER_REAL:
+                spin_lock_irq(&tsk->sighand->siglock);
+                interval = tsk->signal->it_real_incr;
+                val = it_real_value(tsk->signal);
+                spin_unlock_irq(&tsk->sighand->siglock);
+                jiffies_to_timeval(val, &value->it_value);
+                jiffies_to_timeval(interval, &value->it_interval);
+                break;
+        case ITIMER_VIRTUAL:
+                read_lock(&tasklist_lock);
+                spin_lock_irq(&tsk->sighand->siglock);
+                cval = tsk->signal->it_virt_expires;
+                cinterval = tsk->signal->it_virt_incr;
+                if (!cputime_eq(cval, cputime_zero)) {
+                        struct task_struct *t = tsk;
+                        cputime_t utime = tsk->signal->utime;
+                        do {
+                                utime = cputime_add(utime, t->utime);
+                                t = next_thread(t);
+                        } while (t != tsk);
+                        if (cputime_le(cval, utime)) { /* about to fire */
+                                cval = jiffies_to_cputime(1);
+                        } else {
+                                cval = cputime_sub(cval, utime);
+                        }
+                }
+                spin_unlock_irq(&tsk->sighand->siglock);
+                read_unlock(&tasklist_lock);
+                cputime_to_timeval(cval, &value->it_value);
+                cputime_to_timeval(cinterval, &value->it_interval);
+                break;
+        case ITIMER_PROF:
+                read_lock(&tasklist_lock);
+                spin_lock_irq(&tsk->sighand->siglock);
+                cval = tsk->signal->it_prof_expires;
+                cinterval = tsk->signal->it_prof_incr;
+                if (!cputime_eq(cval, cputime_zero)) {
+                        struct task_struct *t = tsk;
+                        cputime_t ptime = cputime_add(tsk->signal->utime,
+                                                      tsk->signal->stime);
+                        do {
+                                ptime = cputime_add(ptime,
+                                                    cputime_add(t->utime,
+                                                                t->stime));
+                                t = next_thread(t);
+                        } while (t != tsk);
+                        if (cputime_le(cval, ptime)) { /* about to fire */
+                                cval = jiffies_to_cputime(1);
+                        } else {
+                                cval = cputime_sub(cval, ptime);
+                        }
+                }
+                spin_unlock_irq(&tsk->sighand->siglock);
+                read_unlock(&tasklist_lock);
+                cputime_to_timeval(cval, &value->it_value);
+                cputime_to_timeval(cinterval, &value->it_interval);
+                break;
+        default:
+                return(-EINVAL);
+        }
+        return 0;
+}
+
+asmlinkage long sys_getitimer(int which, struct itimerval __user *value)
+{
+        int error = -EFAULT;
+        struct itimerval get_buffer;
+
+        if (value) {
+                error = do_getitimer(which, &get_buffer);
+                if (!error &&
+                    copy_to_user(value, &get_buffer, sizeof(get_buffer)))
+                        error = -EFAULT;
+        }
+        return error;
+}
+
+/*
+ * Called with P->sighand->siglock held and P->signal->real_timer inactive.
+ * If interval is nonzero, arm the timer for interval ticks from now.
+ */
+static inline void it_real_arm(struct task_struct *p, unsigned long interval)
+{
+        p->signal->it_real_value = interval; /* XXX unnecessary field?? */
+        if (interval == 0)
+                return;
+        if (interval > (unsigned long) LONG_MAX)
+                interval = LONG_MAX;
+        p->signal->real_timer.expires = jiffies + interval;
+        add_timer(&p->signal->real_timer);
+}
+
+void it_real_fn(unsigned long __data)
+{
+        struct task_struct * p = (struct task_struct *) __data;
+
+        send_group_sig_info(SIGALRM, SEND_SIG_PRIV, p);
+
+        /*
+         * Now restart the timer if necessary.  We don't need any locking
+         * here because do_setitimer makes sure we have finished running
+         * before it touches anything.
+         */
+        it_real_arm(p, p->signal->it_real_incr);
+}
+
+int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue)
+{
+        struct task_struct *tsk = current;
+        unsigned long val, interval;
+        cputime_t cval, cinterval, nval, ninterval;
+
+        switch (which) {
+        case ITIMER_REAL:
+                spin_lock_irq(&tsk->sighand->siglock);
+                interval = tsk->signal->it_real_incr;
+                val = it_real_value(tsk->signal);
+                if (val)
+                        del_timer_sync(&tsk->signal->real_timer);
+                tsk->signal->it_real_incr =
+                        timeval_to_jiffies(&value->it_interval);
+                it_real_arm(tsk, timeval_to_jiffies(&value->it_value));
+                spin_unlock_irq(&tsk->sighand->siglock);
+                if (ovalue) {
+                        jiffies_to_timeval(val, &ovalue->it_value);
+                        jiffies_to_timeval(interval,
+                                           &ovalue->it_interval);
+                }
+                break;
+        case ITIMER_VIRTUAL:
+                nval = timeval_to_cputime(&value->it_value);
+                ninterval = timeval_to_cputime(&value->it_interval);
+                read_lock(&tasklist_lock);
+                spin_lock_irq(&tsk->sighand->siglock);
+                cval = tsk->signal->it_virt_expires;
+                cinterval = tsk->signal->it_virt_incr;
+                if (!cputime_eq(cval, cputime_zero) ||
+                    !cputime_eq(nval, cputime_zero)) {
+                        if (cputime_gt(nval, cputime_zero))
+                                nval = cputime_add(nval,
+                                                   jiffies_to_cputime(1));
+                        set_process_cpu_timer(tsk, CPUCLOCK_VIRT,
+                                              &nval, &cval);
+                }
+                tsk->signal->it_virt_expires = nval;
+                tsk->signal->it_virt_incr = ninterval;
+                spin_unlock_irq(&tsk->sighand->siglock);
+                read_unlock(&tasklist_lock);
+                if (ovalue) {
+                        cputime_to_timeval(cval, &ovalue->it_value);
+                        cputime_to_timeval(cinterval, &ovalue->it_interval);
+                }
+                break;
+        case ITIMER_PROF:
+                nval = timeval_to_cputime(&value->it_value);
+                ninterval = timeval_to_cputime(&value->it_interval);
+                read_lock(&tasklist_lock);
+                spin_lock_irq(&tsk->sighand->siglock);
+                cval = tsk->signal->it_prof_expires;
+                cinterval = tsk->signal->it_prof_incr;
+                if (!cputime_eq(cval, cputime_zero) ||
+                    !cputime_eq(nval, cputime_zero)) {
+                        if (cputime_gt(nval, cputime_zero))
+                                nval = cputime_add(nval,
+                                                   jiffies_to_cputime(1));
+                        set_process_cpu_timer(tsk, CPUCLOCK_PROF,
+                                              &nval, &cval);
+                }
+                tsk->signal->it_prof_expires = nval;
+                tsk->signal->it_prof_incr = ninterval;
+                spin_unlock_irq(&tsk->sighand->siglock);
+                read_unlock(&tasklist_lock);
+                if (ovalue) {
+                        cputime_to_timeval(cval, &ovalue->it_value);
+                        cputime_to_timeval(cinterval, &ovalue->it_interval);
+                }
+                break;
+        default:
+                return -EINVAL;
+        }
+        return 0;
+}
+
+asmlinkage long sys_setitimer(int which,
+                              struct itimerval __user *value,
+                              struct itimerval __user *ovalue)
+{
+        struct itimerval set_buffer, get_buffer;
+        int error;
+
+        if (value) {
+                if(copy_from_user(&set_buffer, value, sizeof(set_buffer)))
+                        return -EFAULT;
+        } else
+                memset((char *) &set_buffer, 0, sizeof(set_buffer));
+
+        error = do_setitimer(which, &set_buffer, ovalue ? &get_buffer : NULL);
+        if (error || !ovalue)
+                return error;
+
+        if (copy_to_user(ovalue, &get_buffer, sizeof(get_buffer)))
+                return -EFAULT; 
+        return 0;
+}